Always centre animation in Wordpress when animation is larger than viewport

Hello. I am embedding an 900 x900 pixel animation into Wordpress. When the viewport is larger than the width of the animation, the animation is centered. But when the width of the animation is larger than the width of the viewport, the animation is aligned to the left rather than to the center. The effect I am aiming for is for the animation to always be cropped to the width of the viewport and always be aligned to the center. I think I should edit the embed code? can anyone help?

Is the Hype document itself responsive, or is it that there's something else above doing the crop-centering?

It might be useful to post a link to the current behavior to see how the present resize is happening as that will probably lead to a solution that can fit your current theme/post's needs.